For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRemoval Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Collision Sectioning Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Disable the SIR System. Refer to SIR Dis ...
Wheel Alignment Measurement
Steering and vibration complaints are not always the result of improper
alignment. One possible cause is wheel and tire imbalance.
Another possibility is tire lead due to worn or improperly manufactured tires.
Lead/pull is defined as follows: At a constant highway speed
on a typical straight ...
Backup Lamp Replacement
Preliminary Procedures
Remove the rear compartment sill trim plate. Refer to Rear Compartment
Sill Trim Plate Replacement.
Disconnect the electrical harness connector from the backup lamp socket.
Back Up Lamp Nut (Qty: 4)
Caution: Refer to Fastener Caution in the Preface ...